Noy. 1904.] BOTANICAL SOCIETY OF EDINBURGH. 31 
Genus CLOSTERIOPSIS, Lemm. 
275. Cl. longissima, Lemm., in “ Forschungsber. Biol. Stat. Pldn,” vii., 
276 
277 
278 
279 
280 
281 
282 
283, 
284. 
285. 
288. 
289, 
1899, p. 29, t. 2, f. 36-38. [Clostertwm pronum, var. longissimum, 
Lemm. (not Rhaphidium longissimum, Schréder). | 
O.—Near Finstown. g 
Var. tropicum, nob. eae longissimum, Schréd., var. 
tropicum, W. and G. S. West, in “Trans. Linn. Soc.,” bot. ser. 2, 
1902, p. 198.] 
Long. 320-370y ; lat. 6-6°5u ; lat. apic. 1-1°2y (fig. 1). 
S.—Plankton of Loch Asta. 
The specimens observed were a little longer than those 
observed from Ceylon, but otherwise very similar. The apices 
were very much prolonged, but never setiform. The chloroplast 
contained about 12 pyrenoids. 
Genus KIRCHNERIELLA, Schmidle. 
. K. obesa (West), Schmidle. S,—Plankton of Neugles Water. 
Genus oOocysTIs, Nag. 
. O. solitaria, Wittr. O—Near Kirkwall; Hoy. S.—Near Lerwick; 
near Scalloway. 
. O. elliptica, West. O.—Kirkwall. 
. O. crassa, Wittr. S.—Plankton of Loch Asta, 
. O. parva, W. and G.S. West. S.—Plankton of Loch Asta. 
. O. asymmetrica, W. and G. S. West. O.—Pond near Kirkwall. 
. O. apiculata, West. S.—Plankton of Loch Asta. 
This species was first described from Sphagnum-pools in the 
Orkney Islands (vide West, in “Journ. Bot.,” April 1893, t. 333, 
i: 4, OF. 
Genus NEPHROCYTIUM, Nig. 
. N. Agardhianum, Nag. [inclus. N. Négelii, Grun]. O.—Kirkwall. 
S.—Plankton of Loch Beosetter, Bressay. 
N. lunatum, West. S.—Plankton of Loch Asta. 
Genus EREMOSPHARA, De Bary. 
E, viridis, De Bary. O.—Near Kirkwall ; Hoy. 
Genus TETRAEDRON, Kiitz. 
. T. regulare, Kiitz. O.—Near Kirkwall. 
Some of the specimens had the angles furnished with short 
spines, but others were destitute of spines. Diam. 23-43u. 
. T. minimum (A. Br.), Hansg. S.—Plankton of Loch Asta. 
Genus DICTYOSPHZRIUM, Nag. 
D. Ehrenbergianwn, Nag. O.—Stromness; Hoy. S.—Plankton of 
Loch Asta. 
Genus BoTRyYOCOCCUS, Kiitz. 
B. Braunit, Kiitz. O—Near Kirkwall, S.—Near Lerwick ; 
Bressay. 
